That decision does not make sense.
There is no need for a third catcher on the roster. Rod Barajas has been playing great this year. I do not see much playing time in Santos's future. My thoughts are that the Mets may be trying to showcase him for a trade.
The Mets should have brought up Jesus Feliciano, who is currently tearing up Triple-A with a .388 batting average through 170 at bats.
This move is clearly a step in the right direction.